cardos5: fix reading of serial number
cardos5: fix reading of serial number

The corresponding GET DATA command only returns the serial,
nothing else.
Tested with CardOS 5.0 and 5.3 cards. The serial number
is the same as shown with other tools

fabled/OpenSC,AktivCo/OpenSC,philipWendland/OpenSC,OpenSC/OpenSC,hongquan/OpenSC-main,OpenSC/OpenSC,Jakuje/OpenSC,CardContact/OpenSC,metsma/OpenSC,hongquan/OpenSC-main,LudovicRousseau/OpenSC,Jakuje/OpenSC,AktivCo/OpenSC,mouse07410/OpenSC,Jakuje/OpenSC,CardContact/OpenSC,dengert/OpenSC,fabled/OpenSC,LudovicRousseau/OpenSC,rickyepoderi/OpenSC,Jakuje/OpenSC,OpenSC/OpenSC,frankmorgner/OpenSC,frankmorgner/OpenSC,mouse07410/OpenSC,mouse07410/OpenSC,fabled/OpenSC,dengert/OpenSC,fabled/OpenSC,metsma/OpenSC,rickyepoderi/OpenSC,hongquan/OpenSC-main,AktivCo/OpenSC,frankmorgner/OpenSC,metsma/OpenSC,dengert/OpenSC,CardContact/OpenSC,frankmorgner/OpenSC,philipWendland/OpenSC,LudovicRousseau/OpenSC,rickyepoderi/OpenSC,philipWendland/OpenSC